Machine for operating upon soles



May 4, 1937. E. w. sTAcEY MACHINE FR OPERATING UPON SOLES Filed May 2e, l1954 l1 Sheets-Sheet 1 mmv /NVfA/TUR May 4, 1937. E. w. sTAcEY MACHINE FOR OPERATING UPON SOLES Filed May 26, 1934 l1 Sheets-Sheet 2 mbv www May 4, 1937. E. w. sTAcr-:Y

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MACHINE FOR OPERATING UPON SOLES Filed May 26, 1934 1l Sheets-Sheet 4 41941 Fig 5' I 43o www May 4, 1937.

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MACHINE FOR OPERATING UPON SOLES May 4, 1937. E. w'. STACEY 2,078,981

MACHINE FOR OPERATING UPON SOLES Filed May 26, 1934 1l Sheets-Sheet 8 364 I 330i 28g i .12. 282 ses T g /f///f 1 gga 11 sheets-sheet 9 E. W. STACEY MACHINE FOR OPERATING UPON SOLES -Filed ll'ay 26, 1934 Tigl.

May 4, 1937.`

May 4, 1937; E. w. sTAcEY 2,078,981

-MACHINE FOR OPERATING UPON SOLES Filed May ze, 1934 11 sheets-sheet 1o :May 4, 1937. E. w.-$TAcEY 2,078,981

MACHINE FOR OPERATING UION SOLES Filed May 26, 1954 1'1 sheets-sheet 11 .T` ,78 l /NVfA/TUR cement and the substance of the sole.

Patented May 1937 UNITED STATES PATENT ori-lc Ernest W. Stacey, Beverly, Mass., assignor to United Shoe Machinery Corporation, Paterson, N. J., a corporation of New Jersey Application May 26, 1934, Serial No. 727,765 In Great Britain March 27, 1934 42 Claims.

This invention relates to machines for operating upon soles for shoes and is herein illustrated as embodied in a machine for automatically rounding an outsole, reducing and roughing its marginal portion to prepare it for attachment by means of cement to tne bottom of a shoe and performing a final smoothing and finishing operation upon the edge of the sole.

An outsole which is to be attached to a shoe by means of cement is cut approximately to final edge contour and the marginal portion at the esh or attaching side of the sole is roughened to prepare it for the reception of the cement so that a satisfactory bond will be insured between the In most instances, the marginal portion of the sole is beveled at a substantial angle along the opposite sides of its shank portion and usually it is also beveled, although at a somewhat less angle, around its forepart. It is a common practice also to smooth and finish the sole edge, at least in the forepart of the sole, by a nal edge trimming operation performed before the sole is attached to the shoe.

One object of the present invention is to provide a machine capable of performing some or all of the above-mentioned operations which will operate rapidly and in. such a manner as to insure superiority in the character of the work performed as well as substantial uniformity of resuits upon the different soles operated upon. Y

With the above object in view, one feature of the present invention consists in the provision, in a machine for operating upon soles, of a reducing l and roughing tool and means for relatively moving the tool and a sole to cause the tool to perform a combined roughing and edge reducing operation upon the sole. Other features of invention will be recognized as residing in novel mechanisms for performing rounding, reducing, roughing and edge trimming or finishing operations, or various combinations of such operations, upon a sole.

In the embodiment of the invention herein illustrated, a sole to be operated upon is clamped against the lower side of a pattern in such a manner as to leave the marginal portion at the attaching side of the sole unobstructed so that it may be acted upon by the operating instrumentalities of the machine. As illustrated,v these instrumentalities comprise a tool in the nature of a milling cutter for performing an initial rounding operation upon the sole, a plurality of cutters for beveling at a relatively steep angle and simultaneously roughing the marginal portion at the shank of the sole, a plurality of cutters for beveling at a substantially less angle and simultaneously roughing the marginal portion at the forepart of the sole, and a trimming cutter for performing a final edge trimming or finishing operation around the forepart of the sole. These cutters are mounted upon two cutter heads which are arranged to rotate about parallel axes perpendicular to the plane of the sole, the rounding cutter and the beveling and roughing cutters for the shank portion of the sole being mounted upon one of the cutter heads while the beveling and roughing cutters for the forepart of the sole and the edge trimming cutter are mounted upon the other cutter head. The cutter heads are mounted in a carrier which carries also two guide rolls for cooperating with the pattern to control the positions of the cutters relatively to the sole, the carrier being pivotally supported on a swinging arm which is springpressed toward the pattern so that both rolls will be maintained in cooperative relation to the pattern. The pattern is carried by a jack to which 20 both turning and straight line movements are imparted at each cycle of operations of the machine to cause the sole margin to move with a substantially constant velocity past the cutters.

In order that the beveling and roughing cutters which act to produce a relatively steep bevel in the shank portion of the sole shall not operate also to produce a similarly steep bevel at the heel and around the forepart of the sole, the cutter head which carries these cutters is mounted for o axial movement and provision is made, as herein illustrated, for maintaining the cutter head in a normal elevated position while the shank portion of the sole is being moved past it and for retracting or lowering the cutter head and maintaining it in a retracted position wherein its beveling and roughing cutters will be removed from operative engagement with the work during such times as the heel and forepart portions of the sole margin are being moved past these cutters. As illustrated, also, the cutting edges of the beveling and roughing cutters on both cutter heads are toothed to cause them to roughen the beveled surfaces which they form upon the soles and the fact that the toothed cutting edges of these cutters are inclined to the axes of rotation of the cutter heads, so that the cutters will bevel the sole margin as well as roughen it, causes the toothed edges to cut grooves or furrows in the sole margin along lines which are envelopes of the arcs described by the cutter teeth as the latter rotate and which consequently extend along lines parallel to the edge of the sole. The illustrated edge trimming cutter is provided with cutting teeth which are shaped to provide a beaded finish to the sole edge and inasmuch as the nish of that character is usually desirable only about the fore part of the sole where the sole edge is of substantial thickness, provision is made in the illustrated machine for moving the edge trimming cutter under the control of the pattern in a direction away from the sole edge an amount Just suilicient to retract the edge trimming cutter from work-engaging position while the shank portions of the sole are being moved past that cutter.

It will be observed from the foregoing that the illustrated machine is provided with novel mechanism whereby, at a single traverse of the sole margin past the beveling and roughing cutters, the latter are caused to cut a relatively steep bevel in the shank portion of a sole and a relatively shallow bevel at the heel and forepart portions of the sole; a novel arrangement of means for roughening the sole margin by cutting furrows therein which extend in directions parallel to the sole edge; and novel mechanism for edge iinishing a portion only of the sole edge constitute further features of the invention. These novel mechanisms and arrangements of parts constitute further features of the present invention.

The invention also consists in other features of construction and combinations and arrangements of parts hereinafter described and pointed out in the claims, the advantages of which will be apparent to those skilled in the art.

The invention will be described with reference to the accompanying drawings, in which Fig. 1 is a view in side elevation of the upper portion of a machine in which the present invention is embodied;

Fig. 2 is a view in vertical section of a portion of the head of the machine;

Fig. 3 is a view in side elevation of the lower portion of the machine;

Fig. 4 is a vertical section through the base of the machine;

Fig. 5 is a vertical section which shows principally in side elevation the mechanism for actuating the shifting lever which moves the driving shaft longitudinally;

Fig. 6 is a view principally in end elevation of the controlling cams shown in side elevation in Fig. 5;

Fig. 7 is a cross-section through the cams shown in Fig. 6;

Fig. 8 is a view in front elevation of a portion of the mechanism supported by the head of the machine, the jack being shown as it appears at the completion of its first turning movement and the clamp frame being shown in its lowered or non-clamping position;

Fig. 9 is a view, partially in horizontal section and partially in plan, of the mechanism shown in Fig. 8;

Fig. 9a is a section on the line IXa--IXa of Fig. 8;

Fig. 10 is a view, partially in vertical section and partially in elevation, of the cutter head carrier and adjacent portions of the carrier supporting arm;

Fig. 11 is a view, partially in vertical section and partially in right-hand end elevation, of the parts shown in Fig. 10;

Fig. l2 is a view, partially in section and partially in plan of the cutter head carrier, the section being taken along the line XII- XII in Fig. 10;

Fig. 13 is a view in vertical longitudinal section of the jack, showing particularly the rackand-pinion mechanism by means of which it is operated and also a portion of the clamp frame;

Fig. 14 is a cross-section taken above the jack showing the jack in its initial position of rest;

Fig. l5 is a cross-section similar to that oi Fig. 14 but showing the jack in another position;

Fig. 16 is a section on the line XVI-XVI of Fig. 14;

Fig. 17 is a perspective view of the pattern;

Fig. 18 is a perspective view of an outsole illustrating the character of the operations performed by the machine;

Fig. 19 is a cross-section taken along the line XIX- XIX of Fig. 18, showing also a portion of the edge trimming cutter in operation upon the sole;

Fig. 20 is a cross-section taken along the line XX-XX of Fig. 18;

Fig. 21 is a perspective view of one of the cutter heads showing the beveling and roughing cutters which operate upon the shank portion of th'e sole, the rounding cutter having been removed;

Fig. 22 is a rear elevational view of the lower part of the machine showing a portion of the driving mechanism;

Fig. 23 is a horizontal section showing the pattern and associated work-guiding cam and the' cutter head carrier, and illustrating particularly the relative positions of those parts when the jack is in its initial position of rest;

Fig. 24 is a fragmentary view of the parts shown in Fig. 23 but showing their relative positions shortly after the start of a cycle of operations of the machine;

Fig. 25 is a view similar to Fig. 24 but showing the parts as they appear at a later stage in the cycle of operations;

Fig. 26 is like a portion of Fig. 25 except that the pattern and the guide rolls have been removed the'better to illustrate the operation of the cutters upon the work; and

Fig. 27 is like a portion of Fig. 25 but shows the parts as they appear at a still later stage in the cycle.

Referring first to Figs. 1 and 3 of the drawings, which when placed one above the other show the whole machine in side elevation, the machine comprises a base or frame 50 in which most of the driving mechanism is contained and a head 52 that is bolted to the base. Mounted in the head y52 is a jack 54 having means for removably supporting thereon a sole pattern of a selected size and style, such, for example, as the pattern P, and having also means including two clamp members 58 and 6U for clamping the work, such as the block outsole S, to the pattern. The pattern and the block sole are supported with their longitudinal axes inclined at approximately 45 to the horizontal since it has been found that this position permits the operator to present the work to the machine and to remove it therefrom with the least effort. 'Ihe jack 54, together with a pattern supported thereon and an outsole clamped to the pattern, are adapted to be moved bodily with respect to the operating instrumentalities of the machine to cause the latter to operate progressively along the marginal portions of the sole. The operating instrumentalities comprise a plurality of cutters carried by two rotary cutter heads 62 and 64 (see Figs. 8, 10 and 12) which are mounted upon an oscillatory carrier 66 and the carrier 66 is mounted at the free extremity of a movable carrier supporting arm 88, the opposite end of which is fast upon an upright shaft 'i6 (best shown u in Fig. 8) that is mounted to turn in a bearing 'l2 in the frame 56 so that the arm 66 may swing to permit the cutters to be moved toward and from operative relation to the work. The cutters comprise a rounding or milling cutter 16 which is carried by the cutter head 62 and is adapted to perform an initial rounding or rough trimming operation *upon the work, a plurality of cutters |8 which are also mounted upon the cutter head 62 and which op.- erate upon the shank portion of the sole to perform a combined reducing or beveling and roughing operation upon the sole margin, a plurality of cutters 86, mounted upon the cutter head 64, for operating around the forepart of the sole to perform a combined reducing or beveling and roughing operation upon the sole margin, and a cutter 82 carried by the cutter head 64 for performing a nal edge trimming and finishing operation around the forepart of the sole. The cutter heads 62 and 64 are rotated continuously at high speed while the machine is in use. 'I'he cutter head 62 is mounted for axial movement enabling it to be raised and lowered relatively to the carrier 66 to move the cutters '|83 toward and from positions to operate upon the work while-the work is being fed past'the "cutters-.the 'raisingA traversing movement of the sole. The cutter head carrier 66 is provided also with two guide rolls 84 and 86 which are located above the cutters in coaxial relation with the'cutter heads 62 and 64, respectively. The arm 68 which supports the cutter head carrier 66 is spring-pressed forwardly to hold the guide rolls 84 and 86 in yielding cooperative engagement with the pattern P or with a cam 88 carried by the jack, thereby to determine the path of relative traversing movement of the cutters and the work. The cutter head carrier 66 i's pivotally mounted in its supporting arm 68 so thatit may tilt relatively to the arm during the relative traversing movement of4 the cutters and the work as required -to maintain lboth guide rolls in engagement with the pattern.

As herein illustrated, the guide roll 66 is formed with a lower peripheral tongue portion 96 of enlarged diameter for cooperating with the pattern to tilt the carrier 66 in a manner to retract the edge trimming or finishing tool 82 from the sole while the shank portion of the sole is being operated upon an amount just sufllcient to render the edge trimming tool inoperative` upon the shank portion of the sole while not `appreciably affecting the action of `thevbeveling and roughing cutters 86. This insures'thatthe edge trimming cutter 82 shall operate only around the forepart and at the heel portion of the sole. A third roll 92 is mounted upon the cutter head carrier 66, beneath the roll 84, for cooperation with the rpate tern to effect the raising and lowering of the` cutter head 64 for the purpose of moving thel shank beveling and roughing cutters i8 to and from operative work-engaging positions.

frame 96 which ismounted upon the jack and is normally held by spring pressure in a workf VWalls of the blocks H6 and H2. pose `of guiding the jack carriage |66 in its sliduing. `and, turning movements, two guide members The .clamp members 58 and 66 are carried by a clamp for starting the cycle of operations of the machine. Springs |62 connected with the treadlcs 98 and |60 tend to hold them in elevated positions. During each cycle of operations, the jack is moved to cause the marginal portion -of the sole to be traversed by the cutters from a point at one side of the heel of the sole forwardly along the shank and forepart, around the toe and then rearwardly along the forepart and shank at the opposite side of the sole to a `point at the heel part opposite the point where the operations began. The sole has then been rounded, its marginal portion beveled and roughened, the angle of bevel in the shank portion being greater than the angle of bevel in the forepart, and the sole edge smoothed and nished around the forepart. The operator then depresses the clamp treadle 98 and removes the sole from the machine. The pattern is removable and it is to be understood that a different pattern is `required for each different size of sole to be operated upon.

The jack 54 comprises a rigid box-like upper structure or carriage 66 which is open at the top and bottom and has elongated parallel side members |68 (see Figs. 13 to'l6) which are connected at their opposite ends by means of blocks |l|6 and ||2, the latterbeing rigidly 'secured to theaside members |68 by means of screws ||4.

f. .Formed in the inner faces of the side members |68 abovethe blocks'l |6 `and ||2 are two longitudinal grooves ||6 (Fig. 16) into which extend 'two flangesil formed on the opposite sides of a rectangular plate |26 which is integral with a sleeve |22 rotatably mounted on a post |24 that is rigid with the head 52 and extends obliquely downward, the sleeve |22 being held from slipping off the bottom of the post |24 by a round, rabbeted plate |26 (Figs. 2 and 13) fastened tov the bottom of the ,post by means of screws |28. A's shown in Fig. 2. the po'st |24 is received in a bore in the head' 52 and is held rigidly in place by means of a draw bolt |36. With this construction, the jack carriage |66 is enabled to slide lon'- gitudinally at times on the plate |26 while the plate |26 and the jack carriage |66 are adapted to turn as a unit at times about the axis of the post |24.

The means for effecting the above-described sliding and turning movements of the jack carriage |66 comprise a driven pinion |32 which l l members |68 have inner vwalls which are semicircular" in cross-section and the curved rack sections '|38 areformed on these semicircular inner For the pur- "I46Vand |42 are located in spaced relation above theblocksl I6 and ||v2 and are rigidly secured to Lthe'upper edges of the side members |68 and one Vor both offthese guide members are adapted to be held at times in contact with a straight stationary guide rail |44v (Figs. 14 and 15) which is secured by means of screws |46 to the head 52. The effective portionof each of the guide m mbers |46. and |42 is U-shaped, the outlines of he l curvedv endscf these portions inside and outside The straight rack sections .i

being semicircles and the inner walls of the guide members registering with the semicircular rack sections.

The pinion |32 which drives the jack is fast upon the lower end of a hollow shaft |48 which is mounted to rotate in an eccentric bore in the post |24 and which has fast upon its upper end la bevel gear |50 meshing with a bevel pinion |52 on the upper en d of an upright shaft |54 rotation of which is initiated by depression of the starting treadle |00.

From the foregoing it will be seen that the jack is suspended from the head of the machine in such a manner that it is always free, when permitted to do so, either to slide in the direction of its length or to rotate about the center of one or the other of the curved outer faces of the two guide members 40 and |42 and that the jack is driven by means including the pinion |32 which engages the endless rack |34 and holds the guide member |40 or the guide member |42 or both of these guide members against the guide rail |44. In its position of rest (shown in Figs. 1 and 14), the 'jack carriage 06 is disposed with its longitudinal axis perpendicular to the guide -rail |44 and the guide member |42 is in contact with the guide rail. When a cycle of operations of the machine is started the jack will rst swing 90 counterclockwise (viewed from above) about K, the center of curvature of the curved outer face of the guide member |42 until the guide member 5 toward the left until it is stopped by engagement of the inner face of the guide member |40 with the sleeve |22, whereupon no further straight line slide movement can take place. The jack will then rotate counterclockwise4 180 until the guide member |42 strikes the guide rail |44. The jack will then slide along the guide rail toward the left until stopped by engagement of the inner face of the guide member |42 with the sleeve |22. The Jack will then rotate to its starting position whereupon the machine will be automatically stopped as the result of mechanism brought into operation by means of a cam |56 on the guide member |42. It will be noted that the guide rail |44 has bent ends, one of which is shown, having slots |51 (Fig. 15) through which screws |46 extend, the slots permitting the ends of the guide rail to slide upon the screws. The ends of the guide rail are supported by coiled springs |58 .which are interposed between the rail and the head of the machine so as to cushion the blows of the jack when it has been rotated through and one or the other of the guide members |40 or |42 strikes the guide rail.

The jack carriage |06 has rigidly secured to it two depending brackets |62 and |64 for supporting the pattern P each bracket having at its lower end a dowel pin 66, the dowel pins being adapted to t tightly in holes |68 in the pattern. As shown, the bracket |64 1comprises a lower portion which carries the dowel pin |66 and which is secured to the upper portion of the bracket by means of a bolt and a nut |65. The pattern P may Iadvantageously be made of wood and except for certain novel features to be described it is similar to the patterns commonly employed in machines of the well-known Planet Sole Rounder type, the edge of the pattern being shaped to correspond to the outline which it is desired to impart to the-sole. 'I'he holes |68 extend entirely through the pattern thus uenabling the pattern to be reversed or turned bottom upward so that the same pattern can be used for both right and left soles. As best shown in Fig. 17, each side of the pattern is faced with a thin layer |10 of nely divided particles of abrasive material to assist in preventing the work from slipping relatively to the pattern after it has been clamped to the latter. That portion of the edge of the pattern which lies adjacent to one side of the pattern cooperates with the guide roll 84 and with the upper and relatively small portion of the guide roll 86 in controlling the action of the cutters when a right sole is being operated upon and that portion of the pattern edge which lies adjacent to the opposite side ci.' the pattern cooperates with the rolls 84: and 86 in controlling the action of the cutters while operating upon a left sole, the pattern being positioned in either case so that the portion of its edge which is to cooperate with the guide rolls as above described shall be uppermost. 'I'he pattern is securely held in place upon the brackets |62 and |64 while the machine is in operation by the upward pressure exerted by the clamps 58 and 60 against the sole. The pattern may be readily removed from the dowel pins |66 when the clamp frame is lowered to enable the pattern to be reversed or replaced by a pattern of a different size or style for use in operating upon a sole of a corresponding size or style.

The guide roll 92 and the relatively large lower portion 90 of the guide roll 86 are adapted to engage the edge of the pattern along the shank portion of the latter and along an area substantially midway between the opposite sides of the pattern. In order to prevent the guide roll 92 and the portion 90 of the guide roll 66 from cooperatively engaging the edge of the pattern around the forepart and at the heel end of the latter, the forepart of the pattern is provided with a groove |12 (Fig. 1'7) which extends around the edge oi its forepart and with grooves |14 in the pattern edge at the heel end of the pattern, these grooves being located midway between opposite sides of the pattern so that when the pattern has been properly placed in the machine the grooves will receive the guide roll 92 and the portion 90 of the guide roll 86 as the pattern is moved past the guide roll.

The clamp frame 96 which carries the clamp members 58 and 60 by means of which the sole is clamped against the pattern is made in the general form of an ordinary C-clamp having straight horizontally disposed upper and lower portions |16 and |18, respectively, and an upright intermediate or connecting portion |80. The clamp frame 96 is carried by the jack carriage |06 and is adapted to be raised and lowered relatively to the pattern for the purpose of clamping and releasing the work. To this end the clamp frame 06 is mounted and operated as follows.

The clamp frame 06 is carried by the long arms of two bell crank levers |84 and |86 which are fulcrumed vin the upper portions of the brackets |62 and |64 which support the pattern. The long arms of the bell crank levers |84 and |86 are made in the form of yokes to straddle the upper portion |16 of the clamp frame 96 and two trunnions, one of which is shown at |32, project from, opposite sides of the clamp frame portion |16 near the upright portion |80 and are mounted to turn in the free ends of the yoke arms of the bell crank lever |84, while two similar trunnions, one of which is shown at |94, project from opposite sides of the upper clamp frame portion |16 near the free extremity of the latter and are mounted to turn in the free ends of the yoke arms of the bell crank lever |86. The downwardly extending` short arm portions |86 of the bell crank lever |84 are connected by means of links |98 with the opposite sides of the downwardlv extending short arm 200 of the bell crank lever |86, thereby connecting the levers |84 and |86 for rocking movements in unison for the purpose of raising and lowering the clamp frame 96. Springs 202, each connected at one end with the short arm portions |96 of the lever |84 and at its opposite end with a portion of the bracket i |64, and springs204, each connected at one end with the short arm 200 of the lever |86 and at its opposite end with a xed post 206 mounted on the jack carriage |06, tend to rock the levers |84 and |86 in directions to hold the clamp frame 96 in its upper or work-clamping position. The clamp frame is adapted to be lowered into a position to release the work by means of a push rod 2|0 which extends through the hollow haft |48 which supports the driving pinionl34. [The lower end of the push rod 2|0 bears againstthe upper edge of the upper clamp frame portion |16 and the upper end of the push rod is pivoted at 2| 2 (Figs. 1 and'2) to a lever 2|4 which is fulcrumed upon a stud 2| 6 carried by the head 52 and I which is acted upon by means of a spring-pressed plunger 2| 8, the force of which tends to lift the lever. The lever 2|4 'is adapted to be swung downwardly for th purpose of lowering the clamp frame 96 by means comprising a rod 220 which connects the free extremity of the lever 2|4 with the long arm of a bell crank lever 222 which is fulcrumed upon a stud 224 carried by the frame 50. 'Ihe short end of the bell crank lever 222 is connected by means of a rod 226 with an arm 228 fast on a'shaft 230 to which is fxedly secured the foot treadle 98. The above-described construction of the operating connections between the treadle 98 and the push rod 2|8 is such that depression of the treadle 98 `will result in a lowering of the clamp frame against the force of the springs 202 and 204, and release of the treadle 98 .will permit those springs to raise the clamp frame into work-clamping position.

The clamps 58 and 60 which are carried by the lower portion |18 of the clamp frame 96 are each provided with work-engaging surfaces which are each shaped in outline as best shown in Fig. 9 to engage the sole only in areas spaced inwardly from the marginal portions which are to be operated upon by the roughing cutters 18 and 80, and which are finely serrated, as indicated at 232, to facilitate holding engagement with the work. 'I'he clamp 58 is secured directly to the lower clamp frame portion |18 by means of bolts 234 and 236 (see also Fig. 9a), these bolts extending through a slot 231 which extends lengthwise of the lower portion |18 of the clamp frame and thus enables the clamp to be adjusted for soles of different lengths. The bolt 236 also extends through an arcuate slot 238 in the base of the clamp 58, this slot being so arranged that, by loosening the bolt 236, the clamp 58 may be rotatably adjusted to a limited extent about the bolt 234 to adjust the clamp between two positions, in one of which the clamp is adapted properly to engage aright sole and in the other of which it is adapted properly to engage a left sole. 'Ihe clamp 60 is formed at the upper end of a cylindrical stem 240 which is slidably received within a tubular support 242,

the lower portion of which is secured by means of bolts 244 and 245 to the lower portion |18 of the clamp frame 96. 'I'he bolt 244 extends through an arcuate slot 246 in the base of the tubular support 242 arranged to permit a limited amount of rotational adjustment of the clamp 60 about the bolt 245 to adapt the clamp to accommodate both left and right soles. The bolts 244 and 245 extend also through a slot 241 in the portion |18 of the clamp frame to permit adjustment of the clamp 60 to accommodate soles of dierent lengths. A spring 248 confined within the tubular support 242 beneath the clamp stem 240 urges the clamp 60 upwardly, the upward movement of the clamp 60 being limited by engagement of a stop screw 249 with the upper end of a slot 250 which is formed inside of the support 242 and through which the stop screw 249 projects. 'I'he screw 249 by engagement with the sides of the slot 250 serves to prevent the clamp 60 from turning relatively to its support 242.

In addition to carrying the pattern and the clamp frame, the jack carriage |06 carries also the cam plate 88 already referred to (see Figs. 8, 9 and 23 to 25), the cam plate 88 being flxedly secured to the pattern supporting bracket |62 and having an edge face 256 for cooperative engagement with the guide rolls 84 and 86 in determining the positions of the cutters at the beginning and at the ending of each cycle of operations when the jack is leaving or approaching its position of rest in which it is shown in Figs. 1, 14 and 23. For this purpose, the cam plate 88 is located in the plane of the pattern at the heel end of the latter so that it constitutes in effect a rearward extension ofthe pattern. A's shown, the cam plate 88 is apertured to receive the upright portion |80 of theclamp frame 96, thereby permitting the clamp frame to move freely through the aperture as the clamps 58 and 60 are moved to and from work-engaging positions. The cam plate-88 operates to effect the retraction of the various cutters and the guide rolls from cooperative relation to the work and the pattern respectively during the latter part of each cycle of operations of the machine to insure that the upright portion |80 of the clamp frame shall not be moved into engagement with the cutters and to facilitate the removal from the pattern of the sole which has just been operated upon and the placing of a new sole in proper position upon the pattern.

In order that the guide rolls may be yieldingly held in engagement with the pattern or with the cam plate 88 during the operation of the machine, and in order that the cutters may be retracted from the work at the completion of each cycle of operations, the arm 68 which carries the cutter head carrier 66 is mounted for swinging movement relatively to the jack, the right-hand end of the arm 68 being fast upon the shaft 10 which is mounted to turn in the bearing 14 in the frame of the machine, as has been already explained. At its free extremity, the arm 68 is connected by means of a cable 260. (Figs. 8 and 9) with the upper end of a strong spring 262 (Fig. 3), the lower end of which is secured to the frame 50, the cable passing over an idler pulley 264 and the force of the spring tending to swing the arm 68 forwardly to hold the guide rolls 84 and 86 in engagement with the pattern or the cam platel 88 and to maintain the .cutters in operative relation to the work. In order that the arm 68 may be swung rearwardly so as to retract the cutters from the work to facilitate removal or adjustment of the cutters, ahand lever 266 is pivoted at 268 on the frame of the machine, the lever being normally retracted from operative engagement with the arm 68 and being so arranged that it may be moved manually to engage the arm 68 and retract the latter against the force of the spring, the lever being movable into such a position that it will maintain the arm 68 in its rearwardly displaced position until the lever is manually swung in the opposite direction for the purpose of releasing the arm. As shown, the arm 68 is a hollow box-like structure, the forward portion of which is open toward the front of the machine to receive the re'ar portion of the cutter head carrier 66 and to receive also the dust produced by the various cutting operations, the interior of the arm being connected by means of a flexible conduit 210 with a blower 212 (Fig. 3) which is operated to carry away the dust. A flexible gate 214 (Fig. 9) carried by the arm 68 yieldingly engages the rear edge of the pattern for the purpose of sealing the dust-re ceiving opening leading to the conduit 210.

'I'he cutter head carrier 66 (Figs. 10, 11 and 12) comprises a lower portion 280 which carries the cutter heads 62 and 64, and an upper portion 282 which is connected with the lower portion by a web 284 and which carries the guide rolls 84, 86 and 92. The cutter head carrier 66 is pivotally mounted upon the arm 68 to enable the carrier to turn freely about an axis which is perpendicular to the sides of the pattern and is located midway between the axes of the guide rolls 84 and 86 so that both the roll 84 and the roll 86 may be maintained in engagement with the pattern as the pattern is moved past the rolls. For this purpose, a block 286 (Fig. 10), which is secured by means of a bolt 290 to the lower portion 280 of the cutter head carrier 66, is pro-l vided with a depending trunnion 292 which is adapted to turn in a bearing formed in a plate 294 which is bolted to downward extensions of the walls of the hollow arm 68 and the upper portion 2,82 of the carrier 66 is socketed to receive a fixed stud 296 (Fig. 10) which is coaxial with the trunnion 292 and which is carried by a plate 298 that is bolted to the upper wall of the hollow arm 68. The common axis of the trunnion 292 and the stud 296 is located in line with and midway between the axes of the guide rolls 84 and 86.

The guide rolls 84 and 86 are mounted to turn upon studs 300 (Figs. 9, 10 and 11) which depend from blocks 302 carried by arms 304 which project forwardly from the upper portion 282 of the cutter head carrier and are rigidly secured to the latter by means of bolts 306. The guide rolls 84 and 86 are held on the studs 300 by the heads of screws 308 carried by the studs, the head of the screw associated with the guide roll 84 being countersunk in the lower side of that roll to avoid interference with the roll 92 located just beneath the roll 84 and mounted independently of the latter, as will be hereinafter explained. In order that the guide rolls 84 and 86 may be adjusted relatively to the c utter head carrier 66 to vary the operative relations of the cutter heads to the work, the blocks 302 are mounted in slots 3I0 in the outer ends of the arms 304 and screws 3I2 are provided for adjusting the blocks in the slots 3I0. The adjusting screws 3|2 extend through and are adapted to turn freely within bores 3|4 formed in the blocks 302 and have threaded engagement with the arms 304. The blocks 302 are confined between the heads of the adjusting screws 3|2 which engage the front ends of the blocks and collars 3|6 (Fig. 11) on the screws which engage the rear sides of the blocks so that by turning the screws 308 the guide rolls 84 and 86 may be adjusted forwardly or rearwardly with respect to the carrier 66.. After being thus adjusted the blocks 302 are rigidly secured to the arms 304 by means of nuts 3I8 on threaded studs 320 which extend upwardly from the blocks, suitable washers 322 being provided between the nuts and the arms 304. The tightening of the nuts 3 I8 will cause shoulders 324 on the blocks 302 to be clamped against the lower surface of the arms 304 at opposite sides of the slots 3I0.

The roll 92 is carried by thev forked forward end of a cylindrical plunger 326 (Fig. 11) the rear portion of which is slidably mounted in a bearing 328 formed in the cutter head carrier 66. The stud 326 is connected with the cutter head 62 so that rearward displacement of the roll 92 caused by the pattern P will result in raising the cutters 18 into the plane of the work.

The cutter heads 62 and 64 are fast upon the upper ends of two shafts 330 and 332 (Fig. 10) which are journaled in bearingsv in the carrier 66. The shaft 330 of the cutter head 62 is mounted to turn upon ball bearings 334 and 336 carried at the upper and lower ends respectively of a sleeve 338 which is mounted for axial sliding movement within a bore 340 in the carrier 66 for the purpose of raising and lowering the beveling and roughing cutters 18. The shaft 332 of the cutter head 64 is mounted to turn on ball bearings 342 and 344 carried at the upper and lower ends respectively of a sleeve 346 which is secured by means of a draw bolt 348 within a bore 350 in the carrier 66.

The slidable sleeve in which the shaft of the cutter head 62 is journaled is supported within the bore 340 in the carrier 66 by mleans of a yoke 356 formed in the forwardly extending arm of a bell crank lever 358 (Fig. l1) the yoke straddling the sleeve between the opposite sides of an annular groove 360 in the sleeve. The bell crank lever 358 is fulcrumed upon a stud 362 which is held within a bore in the carrier 66 by means of a clamp bolt 364, the stud having a head 366 for holding the lever in position upon the stud. The bell crank lever 358 has an upwardly extending arm 368 the upper extremity of which extends into a slot 310 formed in the rear portion of the cylindrical plunger 326 which is formed with a reduced forward portion which is slotted axially to receive the roll 92, and carries a pin 315 upon which the roll 92 is mounted. A spring 380 engaging the rear of the arm 368 of the bell crank lever 358 tends to rock the lever in a direction to lower the cutter head 62 and normally holds the cutter head retracted in its lowermost position and yieldingly maintains the roll 92 in its normal or forwardly displaced position. A stop screw 382 carried by the lever arm 368 is adapted to engage the finished surface on the carrier 66 and constitutes a setting-up adjustment to determine the forwardly displaced position of the roll 92.

The cutter head shafts 330 and 332 extend downwardly below their bearings within the carrier 66 and have belt pulleys 386 and 388 flxedly secured to their lower extremities. These pulleys are driven by means of a belt 390 which passes over an idler pulley 332 mounted upon the cutter head carrier 66 and over a series of idler pulleys 394 which are carried by the arm 68 and over a large driving pulley 396 mounted to turn on the shaft 10 which carries the arm 68. Compounded with the pulley 396 is a pulley 398. The second pulley 390 is driven by a belt 400 which passes downwardly over two idler pulleys 402 and over a driving pulley 404 (Fig. 3) which is fast to the front end of a horizontal shaft 406 that is journaled in bearings in the frame 50. The shaft'406 is driven by means of a belt 408 which passes over a pulley 4|0 that is fast on the rear end of the shaft 406 and over a driving pulley 4|2 on the shaft 4|filv of an electric motor 416 (Fig. 22). The motor 41,6 which is supported upon a bracket 4|8 bolted to the side of the frame 50 is also connected through the belt 408 vwith driving mechanism contained within the frame 50 which will bedescribed in detail hereinafter and which oper ates through connections including theouprigh't shaft |54 to drive the jack 54. The motor 4I6 is started and stopped through a switch'and a push ter heads rotate continuously `but the cycle of.

movements of the jack 54 is initiated by depression of the treadle 98whereby1s,tarting,and driyy ing mechanism, which is containediw'ithirr the frame 50 and which will be hereinafte described,

guide block |42 on the .jackicarriagey which is adaptedto engage a slide block'426 "(Fig. 2) which is mounted upon the head 52 and which is operatively connected through a bell crank lever 428 and a link 430 with the driving mechanism above referred to; As shown, the bell crank lever 428 is fulcrumed upon a rod 432 carried bythe head 52, the lever having a downwardly extending arm the ylower end of which is received between two l spaced lugs 434 on the slide block 4,26 anda rear'- wardly extending arm which is pivoted to the upper end of the link 430. Y

a block or disk 440 (Figs. 10, 11 and 21) having a central aperture for receiving the upper end `ofA thel respective cutter head shaft 330 or 332. The

shaft 330 extends upwardly through the cutterv head 62 and throughacentral aperture in the rounding cutter 16 and is screw threaded to receive a nut 442 by means of which the cutter16 is clamped to the cutter head and the cutter head is clamped to a ange 444 on the shaft. In a like downwardly into a hole in the flange to which the` cutter head is secured to prevent the cutter head from turning relatively to its shaft. As best shown in Figs. 12 and 21, the cutter head 62 has iour beveling and roughing cutters 10. Each of i these cutters consists of an elongated rectangular,

blade of substantial thickness. The cutter blades FB `are rigidly secured by means of bolts 450 to four upstanding marginal lugs 452 on the upper i surface of the cutter head. The cutters 18 are clamped between the heads of the bolts 450 and the adjacent sides of the `lugs 452 by means of nuts 454 on the boltswhich are tightened against countersunk faces on the outer sides of the lugs. Thelugs 452 are equally spaced from each other and from the center` of the cutter head, and the surfaces on the lugs to which the cutters are secured lie ln planes which are parallel to but do not intersect the axis of the cutter head., As a result of this arrangement, the outer ends ofthe cutter blades have a substantial lead over their inner ends. Thus. the cutters will be enabled to cut more easily and less power will be required to rotate them than would be the case if their cut# ting edges extended radially of the cutter head. Extending diagonally across the upper edge faces of the cutter bla-des 18 are teeth 456 which are V-shaped in cross-section and which function to produce roughened surfaces on the work. The outer sides of the cutter blades are ground, as indicated at 458, to provide cutting edges at the outer or leading end of each tooth 456. The blades are made of substantial thickness, as already mentioned. to give them rigidity and to permit them to be-repeatedly ground to .sharpen the the clamp bolts 450 and are positioned with their toothedf/cutting edges inclined relatively to the I, planeofi-otation of the cutter headsso as to Vis rendered operative to rotate` the u ghtsha-ft` |54. The jack is automaticallylsstoppedjat,fthe?. comipletion-of its cycle of movements by stop-piri'gf' mechanism including the carn' 11,56 carried by the work. The teethV 456 extend across the upper hedge ofthe cutter at such angles that they are disposed lengthwise of the cuts or furrows which theirl cutting edges make in the sole and thus have no tendency to distort the furrows to any substantial extent.

The toothed cutting edge of each cutter will forma series of arcuate furrows in the margin ofthe sole each time the cutter is moved in an arcuate path across the sole.

each tooth will cut deepest into the substance of is bothlradal `with respect to the cutter head and perpendicular with respect to the adjacent `portion of the sole edge. After the cutting operation Inas-much as the 1 3 axis `of the cutter head is perpendicular to the plane of the sole the cutters will generate a co- L1 t V `noidal surface as they rotate and consequently Each of the cutter heads 62-and 64 comprisesv v bevel vthe `margin of the sole. The upper, edgehoffl l rthe'fbladeiis backed off at a substantial angle?V to providelelearance between the teeth' and the has started each cutter, in moving inwardly over the edge of the sole, will clear the substance of the sole and not cut into it until it approaches the perpendicular radial reference line above referred to, but as each cutter is moved past the above-mentioned reference line by the continued rotation of the cutter head, the cutter teeth will continue to cut for a substantial distance, the teeth cutting, however, less and lessdeeply into the sole substance as they advance and they may actually clear tne surface of the sole before they pass outwardly over the sole edge. This is on account of the fact that, due to the advancing movement of the sole, the cutter as it sweeps inwardly encounters only that portion acted upon by the preceding cutter, whereas in-sweeping outwardly it encounters material which has not previously been acted upon. The teeth of each cutter thus initially form a series of curved furrows which are substantially concentric (they would be actually concentric if the sole were not being moved-past the cutter) and which extend from points near the above-mentioned reference line to points at, or spaced somewhat inwardly from, the edge of the sole. Substantially allof these furrows except only those portions which are located in the immediate vicinity of the reference line are cut away, however, by the action of the succeeding cutters. Consequently, during and, since there is a row of regularly spaced teeth on each cutter blade, a corresponding series of regularly spaced grooves or furrows is formed in the sole margin, all the furrows being parallel to the sole edge. Each furrow thus ultimately formed in the sole is a curve which is tangent to the multiplicity of arcs initially produced each by a single operation of a cutter blade. In other words, each resulting furrow extends along a line which is one envelope of the series of circular arcs described by a single cutter tooth. The reducing and roughing cutters 80 which are carried by the cutter head 64 are similar to the cutters 18 Just described and they are mounted in a similar manner upon the cutter head 64 except that the toothed cutting edges of the cutters 80 are inclined at a less angle to the plane of the sole than are the cutting edges of the cutters 18 so 'that the cutters 88 which operate around the forepart of the sole shall bevel the sole at a less steep angle than do the cutters 18 which operate along the shank portion of the sole. As already explained, the shank cutters 18 will not operate around the forepart of the sole Abecause of the fact they are main tained in a lowered position while the forepart of the sole is moving past them. While the cutter head 64 has no up-and-down movement, it is obvious the cutters 88 on that head will not operate along the shank portion of the sole because the latter has already been beveled by the more steeply inclined cutters 18 when it reaches the field of action of the cutters 88.

The grooved or furrowed surface 248 produced by means of the cutters 18 and 88 is shown in perspective in Fig. 18 and in cross-section in Figs. 19 and 20. A surface of this character is ideal for the reception of cement inasmuch as the cement is permitted readily to penetrate deeply into the loosened fibers of the leather in such a manner as to insure a perfect bond between the cement and the leather. Inasmuch as the furrows extend lengthwise of the sole edge, they greatly facilitate a proper flowing or leveling off of the cement as the latter is applied. They also tend to prevent undesirable squeeze-out of the cement across the sole edge and upon the upper when the sole-attaching pressure is applied. Inasmuch as the cutters 18 and 80 are out of engagement with the material of the sole as the cutters move past the edge face of the sole, the cutters have no tendency to pull or direct the fibers of the leather outwardly over the sole edge. Consequently, the beveling or roughing operation does not result in the production of "fuzzy edges such as are common to a sole the margin of which has vbeen 4roughened by means of a cutter which cuts deeply into the substance of the sole while moving outwardly in directions substantially perpendicular to the sole edge.

V'Ihe edge trimming cutter 82, which is also mounted upon the cutter head 64, is a single cutter having a plurality of peripheral teeth. This cutter is adapted to smooth and finish the edge of the sole and its teeth are shaped in cross-section, as best shown in Fig. 19, to impart to the sole edge a beaded finish such as that shown at 462 in Figs. 18 and 19. Preferably, the cutting edges of the teeth of the cutter 82 are slightly inclined in a direction to cause the finished sole edges to slope downwardly and inwardly from the flesh or at- .trimmer which operates around the forepart shall be rendered inoperative upon the shank portion of the sole edge, the roll 86 is made with the enlargedv lower portion 88, already referred to.

This enlarged portion 88 of the roll 86 is located in the plane of the grooved portions of the pattern and when it is received in the grooved portions of the pattern the cutter head carrier 66 will be so tilted that the edge trimming cutter 82 will operate upon the sole edge but, when the enlarged portion of the roll 86 is engaged by the ungrooved shank portionA of the pattern, the carrier 66 will be tilted just sufhciently to remove the edge trimming cutter from operative engagement with the sole edge and consequently the latter will not operate along the shank portion of the sole edge. If it should be desired to trim and bead the shank portion of the soie edge, a guide roll 86 having no enlarged lower portion would be employed.

The driving mechanism, including the mechanism for starting andA stopping the machine, will now be described. Referring first to Fig. 4, a driving shaft 410 is mounted for rotating and for endwise sliding movement. This driving shaft is rotated continuously from the belt 408 which, as has already been described, is driven from the motor 4|6 and operates also to rotate continuously the cutter heads 62 and 64. As shown in Figs. 4 and 22, the driving belt 408 passes over a pulley 464 that is mounted to turn on a stud 485 secured to a bracket 466 carried by the frame 56 and the pulley 464 is connected with the driving shaft 418 through reducing gearing comprising a pinion 461 compounded kwith the pulley 464 and a gear 468 fast on the driving shaft 410. To the right-hand end of this driving shaft 418 is fastened a friction clutch member 412 adapted to engage at times a friction clutch member 414 integral with a sleeve through which the shaft 410 extends, said sleeve being rotatably mounted in the frame 58 and having rigidly secured to it a bevel gear 416. The bevel gear 416 meshes with a bevel gear 418 fast to the lower end of the upright shaft 154 which, as already described, is connected to drive the jack carriage. The driving shaft 410 is moved first to the left and then to the right by a yoke 460 having its lower portion fastened to an outer end of a rockshaft 482. 'I'he upwardly extending arms of the yoke 480 are provided with rolls 484 which are located between two collars 486 that are fast to the driving shaft 410. The other end of the rockshaft 482 has fast to it the lower end of a shifting lever 488 (see also Fig. 5). In the operation of the machine, as will be described later, the shifting lever 488 is swung to the left, as viewed in Fig. 4, by means of a tension spring 488, to cause the bevel gear 416 to drive the upright shaft |54 to impart movement to the jack 54. The shifting lever 488 is then returned to the position shown, to stop the rotation of the shaft I 54 so as to bring the iack to rest.

The movements of the shifting lever 488 are controlled by a cam on a cam-shaft 492 which is caused to make half revolutions at proper times, the cam-shaft having fast to it a spiral gear 494 meshing with a small spiral gear 496 on an oblique shaft 498 which is journaled in bearings in the frame 50. A bevel gear 500 on the lower end of the oblique shaft 498-meshes with a bevel gear 502 on a horizontal countershaft 504 which is journaled in bearings in the frame 50 and is disposed in coaxial relation to the driving shaft 410. The countershait 504 has slidably keyed at its lefthand end a hub 506 which carries at its left-hand end a friction clutch member 508 and at its righhand end a friction brake member 5I 0. As shown, the friction brake member 5|0 is being held against a stationary member 5I2 and the friction clutch member 508 is being held out of contact with the adjacent vertical face on the outer end of the friction clutch member 414 at the righthand end of the driving shaft 410. 'I'he common hub 506 of the friction members 508, 5|0 is engaged and moved rst to the left and then to the right by two rolls 5|3 both of which are shown in Fig. 6 carried at the lower ends of the arms of a short fork 5|4, the hub of which is rotatably mounted on a rod 5|6. Also integral with the hub 506 is an upwardly extending lever 5|8 which acts at proper times to shift the friction clutch member 508 and the friction brake member 5 I 0 to impart half revolutions to the cam-shaft 492.

Before going further into the details of construction of the driving mechanism, the general mode of operation of the machine will be briefly described. With the parts ofthe machine in their positions of rest, and while the clamp frame 96 is maintained in its lowered position by depression of the treadle 98, the operator places a sole in position against the bottom of the pattern P and then releases the treadle 98, allowing the clamp member carried by the clamp frame 96 to clamp the sole to the pattern. The treadle |00 is then depressed to start the rotation of the countershaft 504 and the oblique shaft 498 to impart a half revolution to the cam-shaft 492. During this half revolution of the cam-shaft 492, the driving shaft 410 is slid toward the left to engage the clutch members 412 and 414 to start the rotation of the upright shaft |54 and finally the countershaft 504 an`d with it the oblique shaft 498 and cam-shaft 492 are brought to rest. The jack 54 has now started its cycle of movements as a result of which the sole is carried past the cutters on the cutter heads 62 and 64. The movement of the jack continues until the cam |56 on the guide block |42 carried by the jack carriage |06 displaces the slide bar 426 (Fig. 2) thereby pulling up the link 430. Referring now to Fig. 4, the pulling up of the link 430 (the lower portion only of which is shown in this figure) has the same effect as if the treadle |00 were again depressed. Consequently, a second half revolution is imparted to the cam-shaft 492. During this second half revolution of the camshaft 492 the` jack is automatically'stopped in its initial position, as shown in Figs. 1 and 14, the driving shaft 410 is slid toward the right to return it to its normal position and the parts of the machine, with the exception of the cutter heads 62 and 64, the driving shaft 410, and the operating connections between the driving shaft and the cutter heads, come to rest.

Referring now more particularly to Figs. 5, 6 and '7, the cam-shaft 492 and its associated parts will be described. On one side of the gear 494, and rotatable with it and with the cam-shaft 492,

is a cam 520 having a cam track 522 in which runs a small roll 524 carried at the end of a control arm 526, the hub of which is rotatable on the rod 5|6. In the position of the parts shown, the shifting lever 5|8 is being held in a neutral position by a tcnsion spring 528 fast at one end to the lever and at the other end to the frame 50, the spring holding an adjustable'abutment 530 carried by the shifting lever against a stop 532 pivoted on the control arm 526 and held in the position shown by a small compression spring 534, a face on the lower portion of the hub of the stop 532 engaging at this time a shoulder on the control arm 525 which prevents `further rotation of the stop clockwise, as viewed in Fig. 5. The abutment 530 is slidably mounted on -the control lever 526 and may be adjusted by turning an adjusting screw 536. The stop 532 has a tail 538 and extending beneath this tail is the end of a lever 540 which may be swung upwardly about the axis of a rockshaft 542 to which its hub is fast by pushing up a treadle. rod 544, the upper end of which is pivoted to the lever 540. The treadle rod 544 has a vertical slot 546 in its lower end in which is received a pin 548 carried by an arm 550 fast on a rockshaft 552 to which the treadle |00 is secured. The treadle rod -544 has also a shoulder 554 against which there is held by a spring 556 a point of a small latch 558 which is pivoted to the treadle arm 550. A horizontal pin 560 carried by the frame 50 lies in the path of upward movement of a tail 562 of the latch 558. When the treadle |00 is depressed, the treadle rod 544 is pushed upwardly and then released. Upward movement of the treadle rod 544 causes the right-hand end of the lever 540, as shown in Fig. a

4, to swing up and engage the tail 538 of the stop 532 so as to disengage the stop from the abutment 530 on the shifting lever 5|8. The tension spring 528 then swings the lever 5|8 to the right, thereby moving the brake member 5|0 and the friction clutch member 508 to the left. Engagement of the clutch member 508 with the clutch member 412 .on the driving shaft 410 starts the rotation of the countershaft 504 and the cam-shaft 492. During this half revolution of the cam-shaft 492, the control arm 526 moves rst to the right and then to the left. In the left-hand movement of the control arm 526, the stop 532 returns the shifting lever 5|8 to the inoperative position shown and stops the cam-shaft 492 at the end of the half revolution.

It has been explained that during this half revolution of the cam-shaft 492 the driving shaft 410 is slid to the left (Fig. 4) to cause the friction clutch member 412 to engage the friction clutch member 414 and thus to start the rotation of the upright shaft |54 to impart movement to the jack. It has also been "explained that `during the second half revolution of the cam-shaft 492 the driving shaft 410 is slid to the right so as to stop the rotation of the upright shaft |54 and thus to stop the movement of the jack. Referring now more particularly to Figs. 5, 6 and 7, the mechanism for thus sliding the driving shaft 410 will be described in detail. The starting of the rotationof the upright'shaft |54 and the stopping of its rotation are brought about primarily by half revolutions of a cam 510 which is rigid with the worm gear 494 and the cam-shaft 492, the first half revolution of the cam being initiated by depression of the foot treadle |00 and the second half revolution of the cam being initiated by engagement of the cam |56 on the jack carriage with the slide block 426. In Fig. 5 

